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Abstract
In this study, unlike porous carbon as a conventional catalyst support material in fuel cells, nonporous carbon was synthesized in the presence of different HCl concentrations (0.2 M-1 M) and investigated as a support material for platinum (Pt) catalysts in the oxygen reduction reaction (ORR). Since the micropore volume of the synthesized carbons is negligible, the detected surface areas with Brunauer-Emmett-Teller (BET) method were between the range of 19-23 m2/g. Among the support materials, the carbon-supported Pt catalyst synthesized in the presence of 1 M HCl was investigated electrochemically in terms of hydrogen oxidation (HOR) and ORR half-cell reactions in the three-electrode system. The Pt catalyst supported with nonporous carbon, synthesized using 1 M HCl, reached the maximum limiting current value of -1.2 mA/cm2 (@1600 rpm, 5 mV/s) at ORR hydrodynamic curves. Low internal and charge transfer resistances of the same catalyst in electrochemical impedance spectroscopy (EIS) analysis are attributable to its nonporous structure.
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